#include <Arduino.h>

void setup() {
  // put your setup code here, to run once:
  pinMode(0,OUTPUT);//设置引脚功能
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(0,HIGH);//设置高电平
  delay(1000);//延时1秒
  digitalWrite(0,LOW);//设置低电平
  delay(1000);
}